Materials Literature
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The Scalar Relativistic-Zero Order Regular Approximation-Time Dependent Density Functional Theory has been employed to study the sulfur L-edge XANES spectrum of the [Au(25)(SCH(3))(18)](+) model cluster, with the aim to reproduce and rationalize previous experimental data. The salient experimental features are properl…
Abstract Yb 2 Zr 2 O 7 ceramic powders synthesized by chemical‐coprecipitation and calcination method were pressureless‐sintered at 1700 °C for 10 h in air to fabricate dense bulk materials. Hot corrosion studies were performed on Yb 2 Zr 2 O 7 against Na 2 SO 4 and Na 2 SO 4 + V 2 O 5 (molar ratio = 1:1) molten salts…
Lead-free piezoelectric Bi0.5(Na0.78K0.22)0.5TiO3–(Na0.5K0.5)NbO3 ceramics have been synthesized by a conventional solid-state reaction methods at different sintering temperatures (1100–1200°C). The effect of sintering temperature on the crystal structure, density and electrical properties was investigated. The Bi0.5(…
Lanthanum (La) doped BaTiO3-(Bi0.5Na0.5)TiO3 (BT-BNT) positive temperature coefficient of resistivity (PTCR) ceramics were prepared by a conventional solid state reaction method. The microstructure and PTCR effect of BT-BNT ceramics were investigated by scanning electron microscopy and measurement of resistivity-tempe…
The effect of lead magnesium niobate titanate (PMNT) particle size on the dielectric and ferroelectric properties of PMNT- Portland cement (PC) composites was investigated. PMNT of various particle sizes (75–425μm) were used at 50% by volume to produce the composites using the mixing and pressing method. Dielectric pr…
This paper uses structured diffuse scattering to compare and contrast the local crystal structure behaviour of the normal ferroelectric BaTiO3 with a range of relaxor ferroelectric substituted BaTiO3 materials. The results strongly suggest that both normal ferroelectric BaTiO3 and the relaxor ferroelectric substituted…
Silver halides have unique features in solid state physics because their properties are considered to be of borderline nature between ionic and covalent bonding. In AgCl, the self-trapped hole (STH) is centered and partly trapped in the cationic sublattice, forming an Ag(2+) ion inside of a (AgCl(6))(4-) complex as a…
The Γ-phonons of KH2PO4 (KDP) and its deuterated analog DKDP are studied via first-principles linear response calculations. The paraelectric phase shows two instabilities. One for a z-polarized mode, which leads to the spontaneous polarization Ps of the ferroelectric phase. The other corresponds to a two-fold degenera…
SrBi2Nb2O9 (SBN) and SrBi1.9La0.1Nb2O9 (SBLN) have been prepared through conventional solid state route. The crystallographic orientation of the prepared ceramics was investigated using x-ray diffraction. FTIR spectroscopy indicate the growth of single-phase layered perovskite material. The dielectric properties of pr…
Effects of Bi(Zn0.5Ti0.5)O3 (BZT) substitution in Pb(Zr1-xTix)O3 (PZT) piezoelectric ceramics were investigated. Morphotropic phase boundary was observed at x = 0.48 and high piezoelectric properties were observed similarly to the un-substituted PZT ceramics. Piezoelectric properties were improved with 5 mol% BZT subs…
NaNbO3 platelets were synthesized by the topochemical microcrystal conversion method from platelike precursor particles of layer-structured Bi2.5Na3.5Nb5O18 at 950°C in a molten NaCl-salt. The obtained NaNbO3 platelets remained the shape of precursors with width of 5–10 μm, length of 20–30 μm and thickness of 0.5–1 μm…
The traditional procedure for chitosan production involves use of a strong acid (HCl) for demineralization of chitin. This study reports application of a mixed culture of lactic acid bacteria (Lactobacillus plantarum, Lactobacillus acidophilus, and Lactobacillus lactis) fermentation in demineralization of chitin for c…
Bi0.5Na0.5TiO3 (BNT) films were fabricated by chemical solution deposition on Pt/TiO2/SiO2/Si substrates. Homogeneous and stable precursor solutions were prepared by controlling the reaction of starting metal alkoxides. By controlling the chemical composition and structure of the BNT precursor in solution and optimizi…
In order to develop high-temperature lead-free relaxor ferroelectrics, 0.95(K0.5Na0.5) NbO3–0.05Ba(Mg1/3Nb2/3)O3 (0.95KNN–0.05BMN) solid solution was synthesized by conventional solid-state sintering. The diffuse phase transition and the temperature of the maximum dielectric permittivity shifting towards higher temper…
Nanoscale transistors employing an individual semiconducting carbon nanotube as the channel hold great potential for logic circuits with large integration densities that can be manufactured on glass or plastic substrates. Carbon nanotubes are usually produced as a mixture of semiconducting and metallic nanotubes. Sinc…
All sequential steps of transfer from relaxor to normal ferroelectric phase transition are found in Na1/2Bi1/2TiO3-SrTiO3-PbTiO3 if concentration of PbTiO3 increases. The relaxor properties in Na1/2Bi1/2TiO3-SrTiO3-PbTiO3 solid solutions are described by the power law and Vogel-Fulcher relationship. Concentration depe…
Abstract Two nanosized zigzag‐shaped oligophenylene strands incorporating 2,2′‐biphenol units were prepared by Suzuki–Miyaura coupling methodology. The two strands are made up of ten and seven phenyl rings, respectively. Two synthetic pathways were evaluated. The first involved the preparation of the target oligopheny…
Spiral orbit tribometry friction tests performed on Ni-rich Ni 55 Ti 45 titanium ball bearings indicate that this alloy is a promising candidate for future aerospace bearing applications. Microstructural characterization of the bearing specimens was performed using transmission electron microscopy and energy dispersiv…
The Si(100)(2 × 1) surface serves as a template for the formation of Mn wires at room temperature, which are the starting point for the annealing experiments discussed here. The evolution of the Mn surface structures as a function of annealing temperature was observed with scanning tunneling microscopy for the tempera…
The mechanism of lamellar fragmentation in the semi-crystalline polymers with spherulitic structure, is observed at the beginning of plastic flow. It causes significant damage. This elementary mechanism is considered here as a result of plastic deformation coupled with damage, in the framework of generalized standard…